[Colloid Polym Sci] Fabrication of free-standing multilayer films by using pH-responsive microgel as sacrificial layers
writer：Jiawei Zhang, Bin Yuan, Zhiqiang Wang, Tao Chen
keywords：freestanding films, stimuli responsive, microgel
source：期刊
specific source：Colloid and Polymer Science, 2014, 5, 1235-1240
Issue time：2014年
A facile way to prepare free-standing polyelectrolyte multilayer films of poly(sodium 4-styrenesulfonate)(PSS)/poly(diallyldimethylammonium)(PDDA) was developed by applying a new pH-dependent sacrificial system based on cross-linked poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) microgels. The tertiary amine groups of PDMAEMA microgels can be protonated in acidic environment, and the protonated microgels were deposited by layer-by-layer (LbL) technique with PSS. PSS/PDDA multilayer films were constructed on the top of the PSS/microgels sacrificial layers. The LbL assembly process was investigated by UV-vis spectroscopy. Further study shows that the free-standing PSS/PDDA multilayer films can be obtained within 3 minutes by treating the as-prepared films in alkali aqueous solution with a pH of 12.0. The pH-triggered exfoliation of PSS/PDDA multilayer films provides a simple and facile way to prepare LbL assembled free-standing multilayer films.